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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>getline</span><span>getwline</span><span>getdelim</span><span>getwdelim</span></span></strong></div></div></td></tr>
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<td> <div>定义于头文件 <code>&lt;stdio.h&gt;</code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi c source-c">ssize_t getline<span class="br0">(</span><span class="kw4">char</span> <span class="sy2">**</span>lineptr, <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> <span class="sy2">*</span>n, <a href="../../io.html"><span class="kw884">FILE</span></a> <span class="sy2">*</span>stream<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-dynamic-tr t-mark-ts">(动态内存 TR)</span> </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi c source-c">ssize_t getwline<span class="br0">(</span><span class="kw4">wchar_t</span> <span class="sy2">**</span>lineptr, <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> <span class="sy2">*</span>n, <a href="../../io.html"><span class="kw884">FILE</span></a> <span class="sy2">*</span>stream<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-dynamic-tr t-mark-ts">(动态内存 TR)</span> </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi c source-c">ssize_t getdelim<span class="br0">(</span><span class="kw4">char</span> <span class="sy2">**</span> <span class="kw4">restrict</span> lineptr, <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> <span class="sy2">*</span> <span class="kw4">restrict</span> n,<br>
                 <span class="kw4">int</span> delimiter, <a href="../../io.html"><span class="kw884">FILE</span></a> <span class="sy2">*</span>stream<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td> <span class="t-mark-rev t-since-dynamic-tr t-mark-ts">(动态内存 TR)</span> </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi c source-c">ssize_t getwdelim<span class="br0">(</span><span class="kw4">wchar_t</span> <span class="sy2">**</span> <span class="kw4">restrict</span> lineptr, <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> <span class="sy2">*</span> <span class="kw4">restrict</span> n,<br>
                 wint_t delimiter, <a href="../../io.html"><span class="kw884">FILE</span></a> <span class="sy2">*</span> stream<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (4) </td>
<td> <span class="t-mark-rev t-since-dynamic-tr t-mark-ts">(动态内存 TR)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<div class="t-li1"><span class="t-li">1)</span> 表现同 <span class="t-c"><span class="mw-geshi c source-c">getdelim<span class="br0">(</span>lineptr, n, <span class="st0">'<span class="es1">\n</span>'</span>, stream<span class="br0">)</span></span></span> 。</div>
<div class="t-li1"><span class="t-li">2)</span> 表现同 <span class="t-c"><span class="mw-geshi c source-c">getwdelim<span class="br0">(</span>lineptr, n, L<span class="st0">'<span class="es1">\n</span>'</span>, stream<span class="br0">)</span></span></span> 。</div>
<div class="t-li1"><span class="t-li">3)</span> 如同用 <span class="t-lc"><a href="../../io/fgetc.html" title="c/io/fgetc">fgetc</a></span> 从流 <code>stream</code> 读取直至遇到 <code>delimiter</code> ，并将字符存储于 <code>*lineptr</code> 所指向的大小为 <code>*n</code> 的缓冲区，如同用 <span class="t-lc"><a href="../../memory/realloc.html" title="c/memory/realloc">realloc</a></span> 自动增加其大小以适应包含分隔符的整个输入，再加上空终止符。 <code>*lineptr</code> 可以为空，该情况下忽略 <code>*n</code> ， <code>getline</code> 如同用 <span class="t-lc"><a href="../../memory/malloc.html" title="c/memory/malloc">malloc</a></span> 分配一个新缓冲区。
若 <code>delimiter</code> 拥有 <code>unsigned char</code> 范围外的值且非 <span class="t-lc"><a href="../../io.html" title="c/io">EOF</a></span> ，则行为未定义。</div>
<div class="t-li1"><span class="t-li">4)</span> 同 <span class="t-v">(3)</span> ，除了如同以 <span class="t-lc"><a href="../../io/fgetwc.html" title="c/io/fgetwc">fgetwc</a></span> 读入字符，而 <code>delimiter</code> 必须是合法的 <code>wchar_t</code> 或 <span class="t-lc">WEOF</span> 。</div>
<p>若 <code>*lineptr</code> 非空，则若 <code>*lineptr</code> 不是能传递给 <span class="t-lc"><a href="../../memory/free.html" title="c/memory/free">free</a></span> 的指针，或若 <code>*n</code> 小于 <code>*lineptr</code> 所指向内存的被分配大小，则行为未定义。
</p><p>同所有来自动态内存 TR 的函数， <code>getline</code> 仅若实现定义了 <span class="t-c"><span class="mw-geshi c source-c">__STDC_ALLOC_LIB__</span></span> 且用户在包含 <code>stdio.h</code> 前定义 <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT2__</span></span> 为整数常量 <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span> 才保证可用。
</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  lineptr
</td>
<td> -
</td>
<td>  指针，指向空指针，或指向指向最初缓冲区的指针
</td></tr>
<tr class="t-par">
<td>  n
</td>
<td> -
</td>
<td>  指向最初缓冲区大小的指针
</td></tr>
<tr class="t-par">
<td>  delimiter
</td>
<td> -
</td>
<td>  分隔字符
</td></tr>
<tr class="t-par">
<td>  stream
</td>
<td> -
</td>
<td> <span class="t-lc"><a href="../../io/fopen.html" title="c/io/fopen">fopen</a></span> 打开的合法输入流
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p>存储于缓冲区的字符数，包含分隔符，但排除空终止符。
</p><p>错误时返回 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">-</span><span class="nu0">1</span></span></span> 并设置 <code>stream</code> 上的 <span class="t-lc"><a href="../../io/feof.html" title="c/io/feof">feof</a></span> 或 <span class="t-lc"><a href="../../io/ferror.html" title="c/io/ferror">ferror</a></span> 。
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>这些函数等同于其 <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/getdelim.html">POSIX 版本</a>，除了允许但不要求在错误时设置 <span class="t-lc"><a href="../../error/errno.html" title="c/error/errno">errno</a></span> 。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#ifdef __STDC_ALLOC_LIB__</span>
<span class="co2">#define __STDC_WANT_LIB_EXT2__ 1</span>
<span class="co2">#else</span>
<span class="co2">#define _POSIX_C_SOURCE 200809L</span>
<span class="co2">#endif</span>
 
<span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;stdlib.h&gt;</span>
<span class="kw4">void</span> get_y_or_n<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw4">char</span> <span class="sy2">*</span>response <span class="sy1">=</span> <a href="../../types/NULL.html"><span class="kw103">NULL</span></a><span class="sy4">;</span>
    <a href="../../types/size_t.html"><span class="kw100">size_t</span></a> len<span class="sy4">;</span>
    <a href="../../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"Continue? [y] n: "</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">if</span><span class="br0">(</span><span class="br0">(</span>getline<span class="br0">(</span><span class="sy3">&amp;</span>response, <span class="sy3">&amp;</span>len, <a href="../../io.html"><span class="kw886">stdin</span></a><span class="br0">)</span> <span class="sy1">&lt;</span> <span class="nu0">0</span><span class="br0">)</span> <span class="sy3">||</span> <span class="br0">(</span>len <span class="sy3">&amp;&amp;</span> response<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span> <span class="sy1">==</span> <span class="st0">'n'</span><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
        <a href="../../memory/free.html"><span class="kw406">free</span></a><span class="br0">(</span>response<span class="br0">)</span><span class="sy4">;</span>
        <a href="../../program/exit.html"><span class="kw488">exit</span></a><span class="br0">(</span><span class="nu0">0</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="br0">}</span>
    <a href="../../memory/free.html"><span class="kw406">free</span></a><span class="br0">(</span>response<span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">return</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span> 
<span class="br0">{</span>
    get_y_or_n<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Continue? [y] n:</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../io/fgets.html" title="c/io/fgets"> <span class="t-lines"><span>fgets</span></span></a></div></div>
</td>
<td>   从文件流获取一个字符串 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../io/gets.html" title="c/io/gets"> <span class="t-lines"><span>gets</span><span>gets_s</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-until-c11">(C11 中移除)</span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   从 <code>stdin</code> 读取一个字符串 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../io/fgetws.html" title="c/io/fgetws"> <span class="t-lines"><span>fgetws</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div></div>
</td>
<td>   从文件流获取一个宽字符串 <br> <span class="t-mark">(函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../../memory/malloc.html" title="c/memory/malloc"> <span class="t-lines"><span>malloc</span></span></a></div></div>
</td>
<td>   分配内存 <br> <span class="t-mark">(函数)</span> </td></tr>
</table>

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